/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.zookeeper.client;

import org.apache.log4j.Logger;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.Socket;

public class FourLetterWordMain {
	protected static final Logger LOG = Logger.getLogger(FourLetterWordMain.class);

	public static void main(String[] args) throws IOException {
		if (args.length != 3) {
			System.out.println("Usage: FourLetterWordMain <host> <port> <cmd>");
		} else {
			System.out.println(send4LetterWord(args[0], Integer.parseInt(args[1]), args[2]));
		}
	}

	/**
	 * Send the 4letterword
	 * 
	 * @param host the destination host
	 * @param port the destination port
	 * @param cmd  the 4letterword
	 * @return server response
	 * @throws java.io.IOException
	 */
	public static String send4LetterWord(String host, int port, String cmd) throws IOException {
		LOG.info("connecting to " + host + " " + port);
		Socket sock = new Socket(host, port);
		BufferedReader reader = null;
		try {
			OutputStream outstream = sock.getOutputStream();
			outstream.write(cmd.getBytes());
			outstream.flush();
			// this replicates NC - close the output stream before reading
			sock.shutdownOutput();

			reader = new BufferedReader(new InputStreamReader(sock.getInputStream()));
			StringBuilder sb = new StringBuilder();
			String line;
			while ((line = reader.readLine()) != null) {
				sb.append(line + "\n");
			}
			return sb.toString();
		} finally {
			sock.close();
			if (reader != null) {
				reader.close();
			}
		}
	}
}
